Nexium SecureVault

A comprehensive all-in-one security application combining password strength checking, password management, and secure note storage with enterprise-grade encryption.

Features

🔍 Password Strength Checker

• Real-time password analysis
• Strength scoring (0-100)
• Detailed feedback and suggestions
• Automatic strong password generation
• Common password detection

🔐 Password Manager

• AES-256-GCM encryption
• Secure password storage
• Category organization
• Search and filter capabilities
• Auto-fill integration ready

📝 Secure Notes

• Encrypted note storage
• Category and tag organization
• Rich text support
• Search functionality
• Export/import capabilities

Security Features

Encryption

• AES-256-GCM: Authenticated encryption for data
• PBKDF2: Key derivation with 100,000 iterations
• Secure random salt generation
• HMAC verification for data integrity

Authentication

• Master password protection
• Rate limiting (3 attempts, 5-minute lockout)
• Session timeout (30 minutes)
• Optional biometric authentication
• Two-factor authentication support

Data Protection

• Local storage only (no cloud dependency)
• Secure memory handling
• Audit logging
• Backup and recovery options

Installation

Python Desktop Version

1. Install Python 3.8+
2. Install dependencies:

pip install -r requirements.txt

3. Run the application:

python nexium_gui.py

Web Version

1. Open index.html in a modern web browser
2. No additional installation required
3. Works offline with local storage

Usage

First Time Setup

1. Launch the application
2. Create a strong master password
3. Optionally enable two-factor authentication
4. Start adding passwords and notes

Password Management

• Click "Password Manager" tab
• Fill in the form with site details
• Use the password generator for strong passwords
• Save and organize with categories

Secure Notes

• Click "Secure Notes" tab
• Create titled notes with rich content
• Organize with categories and tags
• All content is automatically encrypted

Security Best Practices

Master Password

• Use at least 12 characters
• Include uppercase, lowercase, numbers, and symbols
• Avoid common words or patterns
• Don't reuse from other services

Data Backup

• Regularly export encrypted backups
• Store backups in secure locations
• Test recovery procedures
• Keep backup codes for 2FA

System Security

• Keep your OS updated
• Use antivirus software
• Enable firewall protection
• Regular security scans

Technical Architecture

Encryption Flow

User Data → PBKDF2 Key Derivation → AES-256-GCM Encryption → Secure Storage

Data Storage

• Desktop: SQLite database with encrypted fields
• Web: Browser localStorage with encrypted data
• Backup: Encrypted JSON export format

Key Management

• Master password never stored in plain text
• Keys derived on-demand from master password
• Automatic key rotation capabilities
• Secure key deletion on logout

Development

Project Structure

nexium-project/
├── crypto_manager.py      # Core encryption functions
├── password_checker.py    # Password analysis
├── data_manager.py        # Database operations
├── nexium_gui.py         # Desktop GUI
├── security_features.py   # Advanced security
├── index.html            # Web interface
├── styles.css            # Web styling
├── app.js               # Web application logic
├── crypto-manager.js     # Web encryption
└── requirements.txt      # Python dependencies

Adding Features

1. Fork the repository
2. Create feature branch
3. Implement with security review
4. Add tests and documentation
5. Submit pull request

Security Considerations

Threat Model

• Local attacks: Malware, physical access
• Data breaches: Database compromise
• Password attacks: Brute force, dictionary
• Social engineering: Phishing, pretexting

Mitigations

• Strong encryption at rest
• Rate limiting and lockouts
• Secure coding practices
• Regular security audits
• User education and warnings

License

This project is licensed under the MIT License - see the LICENSE file for details.

Support

For support, feature requests, or security reports:

• Email: Coming Soon
• Support https://discord.gg/zcNRGBMS83

Changelog

v1.0.0 (Initial Release)

• Password strength checker
• Basic password manager
• Secure notes functionality
• AES-256 encryption
• Desktop and web versions

Planned Features

• Mobile applications
• Browser extensions
• Cloud sync (optional)
• Advanced 2FA methods
• Enterprise features